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$$(a - b)^2 + 2ab$$ = ?
$$a^2 - b^2$$
$$a^2 + b^2$$
$$a^2 - 4ab + b^2$$
$$a^2 - 2ab + b^2$$
$$(a - b)^2 + 2ab$$Â
$$a^2+b^2-2ab+2ab$$
$$a^2+b^2$$
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